Balancing party for OPR: Star Quest

Hello, just began to read the rules for this game, and when making a party i have the issue where some characters are worth 200 points while others only 100. Since the game says you must have up to 4 characters i feel like the guy playing the weaker character will feel useless next to a 18HP powerhouse like a Brute ganger.

What are your tips to avoid this? Thanks!